In February, the US civil aviation authority had urged the planemaker to develop a comprehensive action plan to avoid situations such as the door plug that came loose in flight on an Alaska Airlines 737 MAX 9
President of the National Transportation Safety Board, Jennifer Homendy stated that the manufacturer did not provide all the documents and information requested in the investigation
Preliminary report confirmed suspicions that the aircraft did not have the bolts that held the bulkhead that covers the place where an extra emergency exit is located in some versions of the jet